Aerial connecter for radio apparatus



Dec. 26, 1933. c. DAKAN 1,940,997

AERIAL CONNECTER FOR RADIO APPARATUS Filed Nov. 19. 1931 INVENTOR.

(ar/ Da /(cm Patented Dec. 26, 1933 Q UNITED STATES PATIENT; omen: I

7 Claim sh (o1; 259-20) This invention relates to a ground and aerialconnecter for radio receiving sets, and more particularly to a devicemounted in the cabinet of such a set which eliminates the usual grounconnection entirely.

It is customary in radio receiving sets to have a ground wire which isconnected to a water pipe or some other conductor extending ,into theground and, in consequencathe'set is aifected by electrical.disturbances resulting from electric conductors in underground conduits,electric railway rails which serve as conductors, and static conditionsexisting in the ground and which I believe affect the operation of aradio set just as much as static and other electrical disturbanceentering by way of the aerial.

The. use of my device eliminates the usual ground entirely and,consequently, all disturbancesarising from such connection, and I havealso found that by passingthe waves received by the aerial through thisdevice that strayfrequencies and electrical disturbances are trappedanddiverted'so that they are not amplified in the set. 3 The'tonereproduced is, therefore, clarified as much of the aerialdisturbance is thereby removed. 1 A In'addition to this, I have foundthat by the use of my device the'life of a' tube in the set is greatlyincreased, which I believe is due tothe fact that the shock imparted tothe delicate filaments of the tubes is practically eliminated.

In accomplishing these and other objects of 1 my invention, I haveprovided improved details showing the interior thereof of structure, thepreferred form of which is illus-. trated in the accompanying drawing,wherein:

- Fig. 1 is a perspective view of a radio cabinet with my device inposition; V 1 1 Fig. 2 is an enlarged side elevation of my device. 7

Fig. 3 is a cross section taken. on the line 3-3 of Fig. 2.

Fig. 4 is a vertical longitudinal section of the *to the nippleB. v v

The device may be secured at any convenient point in the radio cabinet.by a supporting means [parting from the spirit of my invention.

which is preferably made of a pair of street Us or arcuate members 6 and7 united by a screw threaded nipple 8. One of the Ls, as for instanceth'e l. 7, is providedwith an opening 9 which is closed by means of aplug 10, the purpose of which'will be described later. Secured .to thefree ends of the Ls 6 and '7 are the legs 11 of Ts 12. These :Ts are soarranged that the openings through their-heads will be in longitudinalaxial alignment. Carriedby, the Ts and extending across the spacebetween the adjacent, endsof their heads is a tube 13 preferably formedof glass, although other suitable insulating material may be used.

Surrounding the tube 13 are resilient gaskets. 14

which are forced into the ends of the Ts,'-thereby firmly holding thetube in place and at, the

same time forming a leak-proof joint andiconnecting the open endof theU.

Fitting'snugly into the outer ends of the heads ,of the Ts l2 are'plugs15 formed of insulating 'materiaI.

7 These plugs may be a snug or'drive fit as shown, or they may'bescrewed in if desired. The plugs are provided with a, flange 16 which 9serves asaseat for a'gasket 1'7 interposed be- 0 tween thefiange- 16-andtheend of a T, 12, so as tomake a l ak-proof joint.* The plugs 15 areprovided with a central opening through which screw threaded studs or.rods 18 extend. The inner endsoi these studs are secured to the ends 28of a tubular hermetically sealed cylindrical memberor float 19, which isof, less diameter than the tube 13 and extends longitudinally and con-'centrically therein, and, withthe studs, constitutes' an electricalconductor. Thumb nuts 20,

which; maybe of any desired type, are threaded on the projecting ends ofthe studs 18 and, together with the washer 21, serve to secure anelectrical conductor to a stud. v I

The studs 18 arealsosealed in-the plugs 15 sothat there can be noleakage at this point.

A clamp 22 oi'jany suitable construction, such as is usually employedfor securing theordinary ground wireor' leadto a water pipe, issecured23 such as a spring. clamp or the like, and, if space .in the cabinet isnot available, it may be secured at any convenient place near thereceiving set.

, While Ihave described the U-shaped member as being made, up ofstandard pipe fittings, I do not desireto limit myself thereto as thismember may be made as-an integral casting withoutde After the variousparts of my device have been assembled and care has been taken to renderall joints leak-proof, the plug 10 is removed and a body of paleparafiine 24, now principally a waste by-product and which neversolidifies, is poured through the opening 9 so as. to completely fillthe interior of the U-shaped member and entirely surround thecylindrical member or float 19 and that portion of the studs 18 whichare between the ends of this member and the plugs 15, and, as this paleparafiine is an insulator, it will be readily seen that no electricalconnection exists between the member 19 and its studs 18 and the-U-shaped member 5.

After the device has been thus completed it is placed in position andone end of a conductor 25 attached to a stud 18 by means of the thumbnut 20. Its opposite end is then attached to the aerial binding post ofthe receiving set chassis. A conductor 26 has one end attached to theremaining stud 18 in the same manner and .its opposite end connected tothe aerial} in fact, the conductor 26 may be termed the aerial lead in,A conductor 27 has one end secured to the clamp 22 and its other end issecured to the ground terminal 4 of the chassis.

From the foregoing it will be seen that all reception passing from theaerial to the receiving set must pass through the liquid insulator inthe U-shaped member, which neutralizes to a great extent electricaldisturbances gathered from the air.

I do not desire to limit myself to the use of pale parafline as theliquid insulator in my device, as otherliquids or combination of liquidshaving insulating properties may be employed with-. out departing fromthe spirit of my invention.

What I claim and desire to secure by Letters Patent is:

1. A device of the character described comprising a hollow U-shapedmember, a tube of insulating material connecting the open ends of saidU-shaped member together, an insulating liquid in said member and tube,and an electrical conductor carried by and insulated from said Ushapedmember, said'conductor extending longitudinally'of said tube and throughthe insulating' liquid.

2. A device of the character described comprising a hollow U-shapedconducting member having T-shaped heads, a tubular insulating membercarried by said heads and extending therebetween, insulating plugs forclosing the outer ends of said heads, an electric conductor carried bysaid plugs and extending through said tubular member, and a liquidinsulator located in said U-shaped member and tube.

3. A device of the character described comprising a pair of hollowarcuate members, a hollow connection between selected ends of saidmembers, thereby forming a U-shaped member, T-shaped heads carried bythe opposite endsoi said members, a hollow tubular insulating membercarried by and extending between adjacent ends of said heads, insulatingheads located in the opposite ends of said heads, an electric conductorextending through said insulating heads and said tubular member, and aliquid insulator located in said U-shaped and tubular insulatingmembers.

4. A device of the character described comprising a hollow substantiallyarcuate electrically conductive member, a tubular member formed ofinsulating material connecting the ends of said arcuate member, theinteriors of said members communicating with each other, insulatingplugs for sealing the ends of said arcuate member, an insulating liquidfilling said arcuate and tubular members, and an electric conductorcarried by said plugs and extending through said tubular member.

5. A device of the class described comprising a hollow U-shaped metallicmember, a T-shaped head secured to each end of said member, a tubularinsulating member carried by said heads and having its ends located inadjacent ends of said heads, an insulated plug for closing the oppositeend of each head, an electric conductor extending through said plugs andtubular insulating member, and a liquid insulator in said U-shapedmember and tubular insulating memher.

6. A device of the character described comprising a pair of metallicelbows, a metallic nipple for secur ng said elbows together, a metallicT secured to each of said elbows, the openings in the heads of Ts beingin longitudinal alignment, a tubular member formed of insulatingmaterial extending between and into said We, an insulating plug forclosing the open end of each of said Ts, a hollow hermetically sealedconductor of less diameter than said tubular member extendingconcentrically therethrough, studs carriedby said hollow conductor andextending through said plugs, means for attaching electric conductors tosaid studs, means for connecting an electric conductor to said nipple,and a body of liquid insulating material located in the interior of saidelbows, nipple, Ts and tubular member.

7. A device of the character described comprising a tubular U-shapedmember having a filling opening, hollow open end T-shaped heads carriedby the ends of said U-shaped member and arran ed in longitudinal axialalignment with each other, a tubular member formed of insulatingmaterial located between and extending into the adjacent ends of saidheads, a plug of insulating material located in the opposite end of eachhead, a hollow hermetically sealed conductor of less diameter than saidlast mentioned tubular member extending through and concentric with saidmember, studs carried by the ends of said conductor and extendingthrough said plugs, and a body of liquid insulating material completelyfilling said U-shaped member, heads and hollow insulating member.

CARL DAKAN.

